Air-pump.



C. F. SNYDER.

AIR PUMP. J APPLICATION FILED JULY 12-y 1910.

atented Ra-y 28,

2 SHEETS-SHEET 1.

elevation.- 5 0 CHARLES E'. SNYDAER, OF ALLEGHENY, PENNSYLVANA.

AIR-ruilen noesnso.

Specification. of Letters Patent.

Patented May 28, i912.

Application tiled July 12, 1910. Serial No. 571,571.

To all whom t may concern,

Be it known that I, CHARLES F. SNrnnn, a

1citizen of the United States, residing at Allegheny, in the county of Allegheny and State or' Pennsylvania, have invented new and useful Improvements in Air-Pumps, ot' which the following is a specification.

My invention relates to improvements in air pumps and particularly to air pumps adapted for use in intlating pneumatic tires of vehicle wheels.

r[he primary obj ect of my invention is the production of a simple, compact and durable pump of this character, consisting of few parts and so constructed that the Working parts are evenly balanced and free in action.

Another object of my invention is the provision of means whereby in bringing one of the working parts of the pump into contact with a rotating part or member .of a vehicle, the pump will be actuated to inflate a tire.

A still further object is to provide a coinpaiatively small pump which can be conveniently carried about a person, which is inexpensive, and which can be easily applied to or held in contact with the flywheel or other rotatable part of an engine, or to a rotatable part or t1'ansmission-mechanism driven by the engine, for the purpose of actuating a piston forming part. ot' the pump.

Wlith these and other objects in view, my invention consists in a pump combined with a rotatable friction-device connected with the pist-on ot the pump; in the manner of connecti b@said `triction-device with the piston; an et so ji'iurnaling and support-ing said triction-din'ice and connecting the same 'with the' piston that iii the operation ol the various parts, they are easily balanced and consequently all undue friction or binding eliminated.

It further consists in the construction, arrangement and combination ot' parts to be hereinafter described and particularly pointed out in the subjoined claims.

In the drawings,-- *ligure 1 is .fi-trout e`ievation of my improved pump. Fig. 2 is i. side elevation of the same. Fig'. 3 is an end F ig. t is a transverse section taken on line 4--4, Fie'. l. Fig. 5 is a. longitudinal section taken on line 5*.5, Fig. l. Fig. G is a longitudinal section talien on line 6-6, Fig. 5. Fig. 7 a fragmentary section through the rotatable friction member taken on line 7, Fig. 5. Fig. 8 is a central longitudinal section through the piston. Fig.

9 .is a cross section taken on line 5)*9, Fig. 8. Fig. l() is a central longitudinal section taken on line lO-lO, Fig. S. Fig. l1 is a detached perspective view or' the air-inlet valve of the' piston."

Iteferring now to the drawings in detail, like letters ot' reference refer to corresponding parts in the several figures.

The reference letters A, A1 designate two castings or housing members which constitute'a case or housing wherein the working parts of the pump are confined or mounted forl action. These housing members lie in contact with each other and each comprises a plate a and inwardly directed or opposing flanges t1 to provide a chamber B which is closed at its lower end by a block C. Bolts Dare passed through said housing members and through the block C to form a solid connection between the three parts, as best shown4 in Figs. 5 and G. The front plate a ofthe housing member A is provided near its upper end vwith a hollow boss E forming an extended bearing for mounting the rotatable friction member to be hereinafter described; and the rear plate n of the horsing member A1 is ofi-set at its upper end, as at A, to restrict the space between it and the front plate of the housing member A., strengthening ribs being toriiied on the rear plate where it is ott-set.

The front and rear plates a are held in spaced relation by the langes a." and retained in this condition by the bolts D and a pair oi bolts F. the bolts D. The block C is chambered, as at (l. the chamber being preferably cylindrical and having-the upper portion of its wall screw-threaded to receive the lower screwthreaded end of a cylinder H. Said cylinder is proif'ided with a. hexagonal or other angular collar it which bears against the upper surtace of the blocleC to limit the extent to which it is screwed into the chamber G and also serves as a means for a]iiplying a wrench or other tool for threading the cylinder into said chamber. Obviously, the collar need not necessarily be angular, but I have found this a convenient arrangement for the purpose intended. The cylinder l-l is open at one end and closed at its other end, the closed end being threaded into the chamber G and having one or more ports I for the escape of air from the cylinder. The block C may well be termed a` valve-retaining block 7, since in the preferably in line with and above chamber thereof, I locate a. valve J which is preferably in the form of a disk but may be otherwise formed if desired, said valve being normally held against the lower closed end of the cylinder ll and serving to close the ports I therein; and for the purpose of holding said disk in normal position, a coil spring K is interposed' between it and the end wall of the chamber G. Said end wall has a central threaded opening into which a tube or fitting L is threaded which serves ai a means to connect a flexible tube (not shown) tothe pump, the tube being o't' the common construction used for connection to the tire.

Held for recil'irocating movement in the cylinder ll', is a, piston M which, as shown in the drawings, preferably hasl an integral extension m to which is pivotal'ly connected one end of a pitman N having a wrist-pin n formed on or secured thereto at its other end. rlhe piston may have the usual packing rings and it also has a central longitudinal bore mi, which is beveled at its inner end, as at 'm2, to provide a valve seat for an air inlet Valve NL correspondingly beveled and provided with a llat. stem N fitting Within the bore m1. By reason of said valve stem being made flat, air passages nl are provided on opposite sides thereof for admission of air to the cylinder ll when the Vvalve opens .on the outward stroke ol' the piston. .For the purpose of limiting the reciprocating movement of the valve X1, a transverse bore n3 is provided near the outer end of the piston which intersects the longitudinal bore m1 and passing through the stem ng'ot the air inlet valve is a` pin n* of somewhat less diameterl than the transverse bore In into which opposite ends thereof extend. By making the pin n4 smaller than the bore n3 it is free to move therein and .limits the inward movement of the valve.

AS the piston moves inward, the air inlet valve clos-ies against its scat and the air within the cylinder compressed until the pressure is sullirient to overcome the power of the spring' K, whereupon the lvalve l is allowed to open and the air escapes t'rom the pump. During the outward movement of the piston` the air inlet valve opens: and admits air to the cy|inder to bc compressed on the, next inward movcn'ient ot' the piston. 'n-ites a. rotatable friction wheel having'an axial stud or spindle l projecting from one side which is journahal in the hollow boss L ol thc housingl inen'ibei.' and which is also provided with a sochet it. in its other sido arranged eccentrically therein and in which socket the wrist-pin n. seated said wrist-pin having a conical end nl and the socket it lieing eorrespondiugly shaped at', its inner end t'orthe purpose ot eliminating friction caused by cud thrust. The triction wheel Q occupies the space. bct\'.'een the housing members A, A1 at. one end thereof and the pitman is confined. in its oscillating movement between the olli-setportion A2 of the housing inember Al and the friction wheel wlnreby itis guided for action in a direct line. 'lhe body of 'the friction wheel is provided with a peripheral groove 0 and in this groove are formed small sockets 01, preferably at regular intervals around the wheel, into which are driven pegs S, preferably of metal, having pointed projecting ends, said pegs being embedded in a leather or other friction or Contact strip T set into said groove, as clearly shown in Figs. 5 and T. In applying this friction or Contact strip, it is placed at an intern'iediate point against the pegs b and forced into the groove 0 of the friction wheel and from this point., the strip is stretched around the wheel and forced into the groove progressively until the opposite ends are reached. These ends are beveled or spliced, as at L, andxthe beveled surfaces gliicd and overlapped, the entire strip being` securely driven into the groove and after the glue at the spliced endsl is set, a secure friction surface, resultsl therefrom.

Minor changes in the construction ol' this device may bc resorted to or some ot.: the parts may be omitted, and if desired other parts maybe used to cooperate therewith without departing from the spirit of my invention or sacrificing any of the advantages thereof, it being my intention to have the.

following' claims given the broadest construction permissible by the prior art.

llavingthus described my `invention, what l claim .is,-- v

l.. An air-pump comprising a housing', a friction wheel rotatably mounted within said housing, a cylinder having a valve-cor.- trolled port and being'contined within said housing, a piston rcciprocable within said cylinder, and operative connection between said piston and said friction wheel.

L. .\n air-*pump comprising a housing' constituted by two flanged members providing`- a space tlurebetween, a valve block loetween said members having' a valve-retaining chamber, ay cylinder' extending into said chamber and having a port providing communication between the interior thereof and said chamber, a valve within said valve-retaining' chamber hearing against the cylinder to close said port, a tube-fitting entering said block, a piston reciprocable within said cylinder, and n'eans for actuating said piston.

3. An air-pump comprising two coperating housing members formed to provide a chamber therebetween, a valve-retaining block closing one end of said chamber and itselt having a chamber' formed centrally therein, a cylimler within said first-mentioned chamber having' a port therein, a

spring-controlled valve within the chamber of said valve-retaining block serving to close lsaid port, a piston reciprocable within said cylinder, 'a rotatable friction-wheel journaled in one ot said housing members, and pitman eccentrically connected to said friction-wheel at one end and being -pivotally connected rto said piston at its other end.

4. An air-pump comprising,` two coperating housing members, each comprising au plate having inwardly-directed flanges abutting against the fianges of the cope lating plate, a cylinder situated between said heus ing members and inclosed thereby, said ,cylindcr being` closed at one end and having a port in said end, a spring-controlled valve normally held against said cylinder to close the port therein, a piston reciprocable within said cylinder, a rotatable friction element, and operative connection between said friction element and said piston.

5. in air-pump comprising a cylinder having a valve-controlled port, a piston reciprocable within said cylinder, a housing inclosing,` said parts, and a rotatable Yfriction device partly inclosed by said housing and operatively connected with said piston'.

6. An air-pump con'iprising two housing members, each comprisingplate having;l inwardly-directed flanges at their longitudi* nal marginal portions, the flanges of one plate abutting' against those of the other, one ot said plates having` an olf-set portion at one end and the other plate having; a hollow boss providingl a bearing, a rotatable friction device having a spindle projecting from one side and journaled in said bearing and a socket formed eccentrically in its other side, a cylinder conlined between said housing members having a valve-controlled port, a pistonv reciprocable within said cylinder, and a pitman located between the oH-setportion of one of said plates and the rotatable friction device, saidpitman having a wrist-pin atone end seated in the socket ot 'said friction device and its other end pivotally connected to said piston. a

7. An air-pump comprising a housing, a

SEB

cylinder conined Within said housing and having,r a port, a spring-controlled valve nornially'closing` said port, a piston within said cylinder, a rotatable friction Wheel partly inclosed bylsaid housing and having its body provided with a peripheral groove and a friction strip fitted into said groove, and means for operatively connecting said friction wheel with vthe piston. v

3. An air-pump comprising two housinfT members separated by an intervening` space, a chambered block closing one end of said space, a cylinder within said'space connected to said block and linving va port providing communication between the chamber of said block andthe interior of said cylinder, a disk valve in said chamber normally closing said port, a tube-fitting entering said block, a piston reciprocable Within .aid cylinder and having a longitudinal extension thereon, a pitman pivotally connected at one end to said extension, and a rotatable friciion' clement eccentrically connected to the other end of said pitman.

9. An air pump comprisin` two housingr members, bolts connecting said housing' members, a friction wheel mounted in one end of said housing; members, a cylinder confined between said housing menibers and having one end closed and exteriorly threaded, a valve-i'etaining-block between said housing,- members provided with a chamber into which the closed end of said cylindei' is threaded, a valve within said cham-- ber controlling the escape of air `trom said cylinder, a coil sprin` serving to hold said valve against. said cylimler, and a. pitman confined between one of said housing members and said friction wheel and operatively connecting said piston with said Vfriction wheel;

In testimony whereof, I have allixed my signature in the presence of tivo subscribing witnesses.

l CHARLES l?. Ylllll. lil/litnesses z L. H. McCann,

SAMUEL DiLwoR/rii. 

